Telegraph-repeater



No. 608,846. Patented Aug. 9, I898.

H. P. DONNELLY.

TELEGRAPH REPEATER.

(Application filed June' 23, 1897.)

M10 Modal.)

ngiofi By A TTORNEYS.

HENRY P. DONNELLY, OF CINCINNATI, OHIO.

TELEGRAPH-REPEATER.

SPECIFICATION forming part of Letters Patent No. 608,846, dated August 9, 1898. Application filed June 23, 1897. Serial No. 641,871. (No model.)

To all whom it may concern:

Be it known that I, HENRY P. DONNELLY, of Cincinnati, in the county of Hamilton and State of Ohio, have inventeda new and Improved Telegraph-Repeater, of which the following is a full, clear, and exact description. My invention relates to a mechanism to be employed at a station intermediate of two signaling-stations and to act as a repeater or relay to automatically transmit the signals, thus shortening the length of line operated by one battery. Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in both the figures. Figure 1 is a side elevation of one of the relays used in the mechanism; and Fig. 2 is a diagrammatic View of the connections for the same, showing the entire line.

In operating telegraph instruments during unfavorable weather, when there are apt to be many leaks in the line, the efficiency of the line depends upon its length, the shorter the line the greater being the efliciency. l/Vith this fact in view I have endeavored to shorten the length of the line which will be operated by one battery, and therefore to increase the efficiency of the line. i

The relay which I use in this mechanism is illustrated in Fig. 1. It consists of two electromagnets M and M with a lever D, pivoted at 0 between the two magnets. This leveris provided with an armature I, which should be a permanent magnet, so as to be held toward whichever electromagnet it is thrown until withdrawn by the energizing of the opposite magnet. A permanent magnet placed at the yoke-pieces or constituting the keeper would serve as well as the permanently-magnetized armature. The point desired is that one of these parts should be provided with a permanent magnet, so that the lever may be held toward whichever side it is thrown until withdrawn by energizing the opposite magnet.

The lever D has its upper end curved backward upon itself, forming a hook. It also has a lever 01, which is pivoted thereto by its lower end in such a way that the pivot end is insulated from the main armature-lever. The upper end of this lever is held by spring action against the inner surface of the hook upon the outer end of the armature-lever.

. The relay is also provided with two stops F and F. The forward stop is so placed as to engage the lever cl when the armaturelever is attracted by the magnet M, and in this case the contact between the upper end of the lever d and the hook upon the armature-lever is broken.

The standard .H,' carrying the stop F, is provided with a binding-post m or other suitable means to which the wire may be connected. The connection from the stop F is to the magnet M and from there to one half the main line. Connection is made direct from the main armature-lever D by a cut into the main line.

The wires forming the coil of the magnet M form a part of one half of the main line, but the opposite half from that which includes the magnet M The connection from the armature-lever is to that half of the line which contains the magnet M. The small spring-held lever d is connected by a wire D to local ground.

The entire diagram of the line is shown in Fig. 2. At one terminal station are located the battery B, key K, and ground G, located as shown, and at the other terminal station are located the key K, battery B, and ground G. The two relays forming the rest of the diagram are located at an intermediate point, preferably at about the middle of the distance between the two terminal stations.

This device may be worked by reversals of polarity; but the connections shown are for closed-circuit signaling instruments. At the intermediate station the line is broken. Connection is made from one half of the line through the magnet M of one relay and the magnet M of the other relay, these two magnets being opposite magnets of two relays such as above described. The other half of the circuit is connected through the magnets M and M WVhen the two keys K and K are closed, both relays are in the position shown by the one at the right in Fig; 2. Thisconnects the battery at each terminal station with one of the grounds at the intermediate station. The battery B would be connected with the ground G but disconnected from the ground If the line be broken at one of the keys, as K, the magnet M under the influence of the battery B at the opposite terminal station, will attract the lever D toward it, thus breaking the connection between the spring-arm d and the stop F and denergizing the magnet M This is the position shown in Fig. 2. If now the line be closed, by depressing the key K the circuit from the battery B will pass through the magnet M, lever D, spring-arm d, and connection D to the ground G As the magnet M is not energized, the energizing of the magnet M by this current will draw the lever D toward the magnet M. This breaks the circuit through the spring-arm d and armature-leverD and restores the circuit through arm d and stop F, the arm (Z being displaced through contact with the stop F. The current then passes over the connection A to the magnet M of the other relay through the connection A post F, spring d, and connection D to the ground G As at this time the circuit A through the post F, spring-arm d, and connection D to the ground G is closed, the magnet M is energized equally with the magnet M and the armature-lever D is not affected. It will be seen that by the mechanism described the current through one half of the circuit is used to operate the relays in such a way as to transmit the signal through the other half of the circuit, utilizing for this purpose the battery at the other terminal.

This device is capable of righting itself after any displacement and does not require any attention. Its use will greatly increase the efficiency of a circuit as the working circuit is only one-half the length which it would otherwise be.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patent-- 1. An automatic telegraph-repeater comprising two relays, each having a main and an auxiliary magnet, an armature-lever pivoted between the magnets, a spring-controlled ground connection for one end of the armature-lever,a fixed line connection which transfers said ground connection from the lever to itself when the main magnet is energized, a telegraph-circuit which is broken intermediate its terminals and includes in each half the main magnet of one relay and the auxiliary magnet of the other relay, and a connection from each half of the circuit between its included magnets to the armature-lever of the relay containing its main magnet, substantially as described.

2. A relay having two opposing electromagnets included in different circuits, an armature located between said electromagnets and electrically connected with one of said circuits, and a movable contact device carried by the armature and permanently connected to the ground, said movable contact engaging the armature in one position so as to connect said armature to the ground directly, while in the other position of the armature said contact is electrically connected with the other circuit, and out of connection with the armature-circuit, substantially as described.

3. A relay having two opposing electromagnets, one ofwhich is included in the circuit of one station and the other in the circuit of the next station, an armature located between said electromagnets and electrically connected with one of said circuits, a contactarm carried by the armature and movable relatively thereto, a permanent ground connection for said contact-arm, the contact-arm being adapted for conducting engagement with the armature in one position thereof, and a conducting-stop included in the other circuit and adapted for conducting engagement with said contact-arm to remove it from electrical connection with the armature, substantially as described.

4:. A telegraph-repeater, com prisin g two re-- lays, each having a main and an auxiliary magnet, an armature located between the magnets of each relay, a contact-arm carried by the armature, and permanently connected to the ground, one armature being permanently connected to its main magnet and the other to its auxiliary magnet, each armature being temporarily connected to its contactarm in one position thereof, a telegraph-circuit which is broken between its terminals and includes in each half the main magnet of one relay and the auxiliary magnet of the other relay, and contacts adapted to be engaged by said contact-arm and electrically connected to that magnet of the same relay which has no permanent electrical connection with the armature of the same relay, substantially as described.

HENRY I. DONNELLY. \Vitnesses:

JAs. P. KEANE, P. J. RYAN. 

